Shelf support



FIG. 1 is a front lowered perspective view of a shelf support according to the present invention;

FIG. 2 is a top view of the shelf support of FIG. 1;

FIG. 3 is a left side view of the shelf support of FIG. 1;

FIG. 4 is a front view of the shelf support of FIG. 1; and,

FIG. 5 is a bottom view of the shelf support of FIG. 1.

The broken lines are for illustration purposes only, and form no part of the claimed design. 

The ornamental design for a shelf support, as shown and described. 